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Changes in soil organic carbon,nitrogen and sulphur along a slope gradient in apple orchard soils of Kashmir Himalaya

查看全文 作　　者：Javaid M [1]DAD;Lotfollah [2]ABDOLLAHI 高影响力作者 机构地区：[1]Department of Botany,University of Kashmir,Hazratbal,Srinagar,(J&K),India;[2]Faculty of Agriculture,Payame Noor University,Tehran,P.O.Box 19395-3697,Iran高影响力机构 出　　处：《Journal of Mountain Science》索引2021年第18卷第9期,共11页高影响力期刊 基　　金：Financial assistance awarded to first author under Young Scientist Startup Grant(DST/SERB/337-2014)from Science and Engineering Research Board;Department of Science and Technology;Government of India is highly acknowledged。 摘　　要：Accumulation and losses of soil organic carbon(SOC),total nitrogen(TN)and sulphur(S)influence food security and global warming.Therefore,their spatial distribution and variability at regional scale,and their relation to topographical variables are of great interest.In this study,the variability of SOC,TN and S content was evaluated in apple orchard soils of Kashmir region,at three depths(D1:0-10,D2:10-20,and D3:20-30 cm)on slope gradient i.e.:flat,medium,and high.With an increase in slope,a significant decrease of SOC and TN was observed,with concentration of SOC and TN recorded highest(14.3±2.06 g kg-1&0.97±0.35 g kg-1)in flat slope orchards and lowest(9.6±2.07 g kg-1&0.84±0.41 g kg-1)in high slope orchards.On stock basis,the values recorded for flat,medium,and high slope orchards,for SOC and TN were 54.62±4.24 Mg ha-1&0.38±0.06 Mg ha-1,44.13±5.11 Mg ha-1&0.32±0.09 Mg ha-1,and 38.73±5.94 Mg ha-1&0.28±0.10,respectively.The differences for S concentration and stocks were modest,with flat(0.21±0.15 mg kg-1&0.09±0.0.003 Mg ha-1)>high(0.16±0.07 mg kg-1&0.06±0.007 Mg ha-1)>medium(0.12±0.04 mg kg-1&0.075±0.009 Mg ha-1).Across slopes,SOC,TN and S decreased with increasing soil depth,suggesting clear downward trend.Overall,SOC and TN increased with the increase of altitude,precipitation and clay content while its relationship with soil acidity and soil bulk density was negative.The findings may provide scientific basis to structure agricultural development plans or prioritize regions for soil conservation efforts. 关 键 词：Apple orchards SLOPE Soil organic carbon SULPHUR Total nitrogen Soil bulk density
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